Propeller



e. BAUER.-

PROPELLER. arrucmowmzb 020 14, 1921.

Patented Dec. 5,1922.

Patented 5,192.2.

stairs. "rat GEORGE BAUER, OF NEENAI-I, "WISCONSIIIIEQ'.v

PROPELLEB.

Application filed December 14, 1921. Serial No. 522,276.

and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to new and useful improvements in propellers of the spiral or screw type and has for its primary object the provision of means for causing the water engaged to be forced in an endwise direction and to be prevented from escaping. radially, consequently increasing the propelling action of thedevice.

Another object of this invention is the provision of a propeller of the above stated character which will be simple, durable and efficient, and which may be manufactured and sold at a comparatively low cost.

With these and other objects in view, as will become more apparent as the description proceeds, the invention consists in certain novel features of construction, combination and arrangement of parts as willbe hereinafter more fully described and claimed.

For a complete understanding of my invention, reference is to be had to the following description and accompanying drawings, in which:

Figure 1 is a longitudinal sectional view illustrating a propeller constructed in accordance with my. invention,

' Figure 2 is an end view illustrating the same, and

Figure 3 is a transverse sectional view illustrating the location of the water intake ports in respect to the propeller blades. Referring in detail to the drawings, the

numeral 1 indicates a propeller sleeve in which is secured the ordinary propeller shaft 2 and on which the propeller blades 3 are secured or formed. The blades 3 may be of any desired number and are of spiral formation and each blade extends half way about the sleeve 1. In the drawing I have elected to show the employment of a pair of blades, however, I do not desire to be limited to the number of blades, and it is to be noted that the blades are so arrangedon the sleevev 1' that they cooperate with each other in forming a complete spiral passage and they have their ends terminating substantially in alinement with each other. The outer edges of the blades 3 are secured to a casing 4; which 7 is provided with intake ports or slots 5 and said slots at one edge are provided with fins 6 to direct water into the casing and spiral passage formed by the blades 3 during the rotation ,of the device. The slots are arranged longitudinally in the casing 4 andtheir ends terminate adjacent the ends of the blades 3. The ends of'the blades are reipforced or strengthened, as illustrated at In operation, during the rotation of the device, the water is forced outwardly in an endwise direction from one end of the easing and is received from the opposite end of the casing and also by the ports or slots 5 for the purpose of increasing the density of the water within the spiral passage. It is to be understood that the fins 6 will have a tendency to drive water into the spiral passage formed by the blades 3 and consequently prevent the water in the spiral passage from escaping in a radial'direction and which is also aided by the casing 4.

While I have shown and described the preferred embodiment of my invention, it will be understood that minor changes in con: struction, combination and arrangement of parts may be made without departing from the spirit and scope of the invention as claimed.

Having thus described my what I claim is:

1. A propeller including a propeller shaft sleeve, spiral blades secured to the sleeve, a casing surrounding said blades and having ports to admit water to said blades, and fins formed on one edge of the ports to direct water through said ports.

2. A propeller including a propeller shaft sleeve, spiral blades secured to said sleeve and each blade extending one-half way invention,

around the sleeve and cooperating with each other in forming av spiral passage, a cylindrical casing secured to the outer edges of the, blades and having ports arranged between the ends of the blades and fins carried by said casing for directing water through the ports.

In testimony whereof I aflix my signature Witnesses:

C. H. GERHARDT, WM. A; GERHARDT. 

